<?php 
################################################################################### 
# 
# XML Library, by Keith Devens, version 1.2b 
# http://keithdevens.com/software/phpxml 
# 
# This code is Open Source, released under terms similar to the Artistic License. 
# Read the license at http://keithdevens.com/software/license 
# 
################################################################################### 

################################################################################### 
# XML_unserialize: takes raw XML as a parameter (a string) 
# and returns an equivalent PHP data structure 
################################################################################### 
function & XML_unserialize(&$xml){ 
    $xml_parser = &new XML(); 
    $data = &$xml_parser->parse($xml); 
    $xml_parser->destruct(); 
    return $data; 
} 
################################################################################### 
# XML_serialize: serializes any PHP data structure into XML 
# Takes one parameter: the data to serialize. Must be an array. 
################################################################################### 
function & XML_serialize(&$data, $level = 0, $prior_key = NULL){ 
    if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"\n"; } 
    while(list($key, $value) = each($data)) 
        if(!strpos($key, ' attr')) #if it's not an attribute 
            #we don't treat attributes by themselves, so for an empty element 
            # that has attributes you still need to set the element to NULL 

            if(is_array($value) and array_key_exists(0, $value)){ 
                XML_serialize($value, $level, $key); 
            }else{ 
                $tag = $prior_key ? $prior_key : $key; 
                echo str_repeat("\t", $level),'<',$tag; 
                if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element 
                    while(list($attr_name, $attr_value) = each($data["$key attr"])) 
                        echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"'; 
                    reset($data["$key attr"]); 
                } 

                if(is_null($value)) echo " />\n"; 
                elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>\n"; 
                else echo ">\n",XML_serialize($value, $level+1),str_repeat("\t", $level),"</$tag>\n"; 
            } 
    reset($data); 
    if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; } 
} 
################################################################################### 
# XML class: utility class to be used with PHP's XML handling functions 
################################################################################### 
class XML{ 
    var $parser;   #a reference to the XML parser 
    var $document; #the entire XML structure built up so far 
    var $parent;   #a pointer to the current parent - the parent will be an array 
    var $stack;    #a stack of the most recent parent at each nesting level 
    var $last_opened_tag; #keeps track of the last tag opened. 

    function XML(){ 
         $this->parser = &xml_parser_create(); 
        xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false); 
        xml_set_object(&$this->parser, &$this); 
        xml_set_element_handler(&$this->parser, 'open','close'); 
        xml_set_character_data_handler(&$this->parser, 'data'); 
    } 
    function destruct(){ xml_parser_free(&$this->parser); } 
    function & parse(&$data){
        $this->document = array(); 
        $this->stack    = array(); 
        $this->parent   = &$this->document; 
        $return = xml_parse(&$this->parser, &$data, true);
        if ($return) {
        	return $this->document;
        }else{
        	return NULL; 
        }
    } 
    function open(&$parser, $tag, $attributes){ 
        $this->data = ''; #stores temporary cdata 
        $this->last_opened_tag = $tag; 
        if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before 
            if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric 
                #this is the third or later instance of $tag we've come across 
                $key = count_numeric_items($this->parent[$tag]); 
            }else{ 
                #this is the second instance of $tag that we've seen. shift around 
                if(array_key_exists("$tag attr",$this->parent)){ 
                    $arr = array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]); 
                    unset($this->parent["$tag attr"]); 
                }else{ 
                    $arr = array(&$this->parent[$tag]); 
                } 
                $this->parent[$tag] = &$arr; 
                $key = 1; 
            } 
            $this->parent = &$this->parent[$tag]; 
        }else{ 
            $key = $tag; 
        } 
        if($attributes) $this->parent["$key attr"] = $attributes; 
        $this->parent  = &$this->parent[$key]; 
        $this->stack[] = &$this->parent; 
    } 
    function data(&$parser, $data){ 
        if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags 
            $this->data .= $data; 
    } 
    function close(&$parser, $tag){ 
        if($this->last_opened_tag == $tag){ 
            $this->parent = $this->data; 
            $this->last_opened_tag = NULL; 
        } 
        array_pop($this->stack); 
        if($this->stack) $this->parent = &$this->stack[count($this->stack)-1]; 
    } 
} 
function count_numeric_items(&$array){ 
    return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0; 
} 
?>